Resists naughty nurses (7)
I believe the answer is:
sisters
'nurses' is the definition.
(female nurses are often addressed as sister)
'resists naughty' is the wordplay.
'naughty' indicates anagramming the letters.
'resists' anagrammed gives 'SISTERS'.
(Other definitions for sisters that I've seen before include "Patient attention required from such" , "Family relatives" , "Aunts may be" , "Relatives in hospital?" , "Resists (anag)" .)